Chapter 2: Problem 17
Briefly explain why it is advisable to avoid the use of convenience samples.
Chapter 2: Problem 17
Briefly explain why it is advisable to avoid the use of convenience samples.
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Get started for freeBased on a survey conducted on the DietSmart.com web site, investigators concluded that women who regularly watched Oprah were only one-seventh as likely to crave fattening foods as those who watched other daytime talk shows ( San Luis Obispo Tribune, October 14,2000 ). a. Is it reasonable to conclude that watching Oprah causes a decrease in cravings for fattening foods? Explain. b. Is it reasonable to generalize the results of this survey to all women in the United States? To all women who watch daytime talk shows? Explain why or why not.
Is status related to a student's understanding of science? The article "From Here to Equity: The Influence of Status on Student Access to and Understanding of Science" (Culture and Comparative Studies [1999]: \(577-\) 602) described a study on the effect of group discussions on learning biology concepts. An analysis of the relationship between status and "rate of talk" (the number of ontask speech acts per minute) during group work included gender as a blocking variable. Do you think that gender is a useful blocking variable? Explain.
Do ethnic group and gender influence the type of care that a heart patient receives? The following passage is from the article "Heart Care Reflects Race and Sex, Not Symptoms" (USA Today, February 25,1999 , reprinted with permission): Previous research suggested blacks and women were less likely than whites and men to get cardiac catheterization or coronary bypass surgery for chest pain or a heart attack. Scientists blamed differences in illness severity, insurance coverage, patient preference, and health care access. The researchers eliminated those differences by videotaping actorstwo black men, two black women, two white men, and two white women - describing chest pain from identical scripts. They wore identical gowns, used identical gestures, and were taped from the same position. Researchers asked 720 primary care doctors at meetings of the American College of Physicians or the American Academy of Family Physicians to watch a tape and recommend care. The doctors thought the study focused on clinical decision-making. Evaluate this experimental design. Do you think this is a good design or a poor design, and why? If you were designing such a study, what, if anything, would you propose to do differently?
c. One problem with the pet-related questions is the reliance on memory. That is, parents may not actually remember when they got their pets. How might you check the parents' memories about these pets?
An article titled "Guard Your Kids Against Allergies: Get Them a Pet" (San Luis Obispo Tribune, August 28 , 2002) described a study that led researchers to conclude that "babies raised with two or more animals were about half as likely to have allergies by the time they turned six." a. Do you think this study was an observational study or an experiment? Explain. b. Describe a potential confounding variable that illustrates why it is unreasonable to conclude that being raised with two or more animals is the cause of the observed lower allergy rate.
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